INFLUENCE OF LOW MOLECULAR WEIGHT ORGANIC ACIDS ON PHOSPHORUS BIOAVAILBILITY IN A P-FIXED COCOA SOIL IN SOUTH WESTERN NIGERIA.

Paul E Aikpokpodion

Abstract



P-fixation is a major factor limiting phosphorus bioavailability in Nigerian cocoa soils. Low molecular weight organic acids have the potential to minimize phosphorus adsorption due to their ability to form complexes with aluminium and iron oxides which are the major soil minerals responsible for phosphorus fixation in most Nigerian agricultural soils. The present study evaluates the impacts of selected organic acids on phosphorus bioavailability in soil. Results show that, soil samples treated with both oxalic and succinic acids had lower adsorbed phosphorus and higher solution phosphorus available for plant uptake compared with the untreated soil. Among the various adsorption models considered, Langmuir model best described phosphorus adsorption in the studied soil. The study reveals that, the presence of oxalic and succinic acids in soil can reduce phosphorus fixation thereby increasing the efficient utilization of applied phosphorus fertilizer in cocoa soils.

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